A bloke can never have enough bikes. The optimum number is n+1 where n is the current size of the collection.
I rode across America on a Scott CR1 Pro. I’ve also got a Genesis Vapour cyclocross bike for winter training because the roads where I live are pitted with potholes deep enough to unsettle a speleologist. There are some nice off road trails too so a Giant Anthem X 29er 0 mountain bike completes the collection…for now!
I bought the Scott and the Genesis from Epic Cycles in Ludlow, Shropshire. It’s my local bike shop but their prices are better than all of the online retailers I Googled. They also offer a bike fitting service which, of course, you can’t get when buying on the web.